Sorry for pasting a long code here, and I was in a little quandary for a while, but still decided to post this question which may seem a bit silly.
Assuming I have a variable of drugs coded in 4-digit numbers (e.g., 1101, 7100...), and I need to create value labels to interpret them back to the actual drug names (e.g., Codeine, Cannabinoids...). The code is attached.
I generated the following codes but something weird happened. STATA kept reporting error of "invalid syntax" but I was unable to capture any grammatical errors or misspellings. I scrutinize each line and make sure each line ends with three slashes preceded by a blank. The code is followed by a detailed description of the issue.

However, if I used /* ... */ to disable the following part, which is the last section of the value labels (as seen below), and remove the three slashes after "Naltrexone", the code works!
It appears that the code only runs up to the "Naltrexone" position and from "Opioid" onwards the code refuses to execute.
Believe it or not, if you add the 9299 "Opioid" line to the code, STATA will pop up with a invalid syntax error.
I hope I can count on your help here. Fortunately, the part of the code that STATA refuses to execute is not too much and I can enter these value labels manually as well
.
Assuming I have a variable of drugs coded in 4-digit numbers (e.g., 1101, 7100...), and I need to create value labels to interpret them back to the actual drug names (e.g., Codeine, Cannabinoids...). The code is attached.
I generated the following codes but something weird happened. STATA kept reporting error of "invalid syntax" but I was unable to capture any grammatical errors or misspellings. I scrutinize each line and make sure each line ends with three slashes preceded by a blank. The code is followed by a detailed description of the issue.
Code:
/* ====================== Define and apply drug value labels ====================== */ label define Prim_drug -1 "Not applicable" /// 0 "Not stated" /// 1100 "Organic Opiate Analgesics" /// 1101 "Codeine" /// 1102 "Morphine" /// 1199 "Organic" /// 1200 "Semisynthetic Opiate Analgesics" /// 1201 "Buprenorphine" /// 1202 "Heroin" /// 1203 "Oxycodone" /// 1298 "Buprenorphine or Naloxone" /// 1299 "Semisynthetic Opiate Analgesics NEC" /// 1300 "Synthetic Opiate Analgesics" /// 1301 "Fentanyl" /// 1303 "Levomethadyl" /// 1304 "Meperidine" /// 1305 "Methadone" /// 1306 "Pethidine" /// 1307 "Tramadol" /// 1399 "Synthetic" /// 1400 "Non Opiate Analgesics" /// 1401 "Acetylsalicylic" /// 1402 "Paracetamol" /// 1403 "Ibuprofen" /// 1499 "Non Opiate Analgesics NEC" /// 2100 "Alcohols" /// 2101 "Alcohol" /// 2102 "Methanol" /// 2199 "Alcohols NEC" /// 2200 "Anaesthetics" /// 2201 "Gamma-hydroxybutyrate" /// 2202 "Ketamine" /// 2203 "Nitrous oxide" /// 2204 "Phencyclidine" /// 2205 "Propofol" /// 2299 "Anaesthetics" /// 2300 "Barbiturates" /// 2301 "Amylobarbitone" /// 2302 "Methylphenobarbitone" /// 2303 "Phenobarbitone" /// 2399 "Barbiturates" /// 2400 "Benzodiazepines," /// 2401 "Alprazolam" /// 2402 "Clonazepam" /// 2403 "Diazepam" /// 2404 "Flunitrazepam" /// 2405 "Lorazepam" /// 2406 "Nitrazepam" /// 2407 "Oxazepam" /// 2408 "Temazepam" /// 2499 "Benzodiazepines," /// 2501 "Gamma-hydroxybutyrate" /// 2502 "Gamma-butyrolactone" /// 2503 "Butanediol" /// 2599 "GHB NEC" /// 2901 "Chlormethiazole" /// 2902 "Kava lactones" /// 2903 "Zopiclone" /// 2904 "Doxylamine" /// 2905 "Promethazine" /// 2906 "Zolpidem" /// 2999 "Other sedatives and hypnotics" /// 3100 "Amphetamines NFD" /// 3101 "Amphetamine" /// 3102 "Dexamphetamine" /// 3103 "Methamphetamine" /// 3104 "Amphetamine" /// 3199 "Amphetamines" /// 3200 "Cannabinoids" /// 3201 "Cannabinoids" /// 3300 "Ephedra" /// 3301 "Ephedrine" /// 3302 "Norephedrine" /// 3303 "Pseudoephedrine" /// 3399 "Ephedra" /// 3400 "Phenethylamines" /// 3401 "D.O.B." /// 3402 "D.O.M." /// 3403 "M.D.A." /// 3404 "M.D.E.A." /// 3405 "MDMA/Ectasy" /// 3406 "Mescaline" /// 3407 "P.M.A." /// 3408 "T.M.A." /// 3411 "D.O.I" /// 3412 "PMMA" /// 3413 "2C-B" /// 3414 "Phenethylamine analogues" /// 3499 "Phenethylamines" /// 3500 "Tryptamines" /// 3501 "Atropinic" /// 3502 "Diethyltryptamine" /// 3503 "Dimethyltryptamine" /// 3504 "Lysergic" /// 3505 "Psilocybin" /// 3506 "Tryptamine" /// 3599 "Tryptamines" /// 3600 "Volatile nitrates" /// 3601 "Amyl nitrates" /// 3602 "Butyl nitrates" /// 3699 "Volatile nitrates NEC" /// 3700 "Cathinones" /// 3701 "Cathinone" /// 3702 "Methcathinone" /// 3703 "Cathinone" /// 3799 "Cathinones," /// 3800 "Piperazines" /// 3801 "1-Benzylpiperazine" /// 3802 "1-(3-Trifluoromethylphenyl)-piperazine" /// 3803 "1-(3-Chlorophenyl)-piperazine" /// 3804 "Phenylpiperazine" /// 3899 "Piperazines NEC" /// 3900 "Other stimulants and hallucinogens" /// 3901 "Caffeine" /// 3902 "Cathinone" /// 3903 "Cocaine" /// 3904 "Methcathinone" /// 3905 "Methylphenidate" /// 3906 "Nicotine" /// 3999 "Other stimulants and hallucinogens" /// 4000 "Anabolic agents" /// 4100 "Anabolic androgenic steroids" /// 4101 "Boldenone" /// 4102 "Dehydroepiandrosterone" /// 4103 "Fluoxymesterone" /// 4104 "Mesterolone" /// 4105 "Methandriol" /// 4106 "Methenolone" /// 4107 "Nandrolone" /// 4108 "Oxandrolone" /// 4111 "Stanozolol" /// 4112 "Testosterone" /// 4199 "Anabolic androgenic steroids NEC" /// 4200 "Beta2 agonists" /// 4201 "Eformoterol" /// 4202 "Fenoterol" /// 4203 "Salbutamol" /// 4299 "Beta2 agonists NEC" /// 4300 "Peptide hormones mimetics" /// 4301 "Chorionic gonadotrophin" /// 4302 "Corticotrophin" /// 4303 "Erythropoietin" /// 4304 "Growth hormones" /// 4305 "Insulin" /// 4399 "Peptide" /// 4900 "Other anabolic agents" /// 4901 "Sulfonylurea hypoglycaemic agents" /// 4902 "Tamoxifen" /// 4903 "Thyroxine" /// 4999 "Other anabolic agents" /// 5000 "Antidepressants and antipsychotics" /// 5100 "Monoamine oxidase inhibitors" /// 5101 "Moclobemide" /// 5102 "Phenelzine" /// 5103 "Tranylcypromine" /// 5199 "Monoamine" /// 5200 "Phenothiazines" /// 5201 "Chlorpromazine" /// 5202 "Fluphenazine" /// 5203 "Pericyazine" /// 5204 "Thioridazine" /// 5205 "Trifluoperazin" /// 5299 "Phenothiazines," /// 5300 "Serotonin reuptake inhibitors" /// 5301 "Citalopram" /// 5302 "Fluoxetine" /// 5303 "Paroxetine" /// 5304 "Sertraline" /// 5399 "Serotonin reuptake inhibitors NEC" /// 5400 "Thioxanthenes" /// 5401 "Flupenthixol" /// 5402 "Thiothixene" /// 5499 "Thioxanthenes" /// 5500 "Tricyclic antidepressants" /// 5501 "Amitriptyline" /// 5502 "Clomipramine" /// 5503 "Dothiepin" /// 5504 "Doxepin" /// 5505 "Nortriptyline" /// 5599 "Tricyclic" /// 5600 "Atypical antipsychotics" /// 5601 "Amisulpride" /// 5602 "Aripriprazole" /// 5603 "Clozapine" /// 5604 "Olanzapine" /// 5605 "Quetiapine" /// 5606 "Risperidone" /// 5607 "Ziprasidone" /// 5699 "Atypical antipsychotics NEC" /// 5901 "Butyrophenones" /// 5902 "Lithium" /// 5903 "Mianserin" /// 5999 "Other" /// 6000 "Volatile solvents" /// 6100 "Aliphatic" /// 6101 "Butane" /// 6102 "Petroleum" /// 6103 "Propane" /// 6199 "Aliphatic" /// 6200 "Aromatic" /// 6201 "Toluene" /// 6202 "Xylene" /// 6299 "Aromatic hydrocarbons" /// 6300 "Halogenated hydrocarbons" /// 6301 "Bromochlorodifluoromethane" /// 6302 "Chloroform" /// 6303 "Tetrachloroethylene" /// 6304 "Trichloroethane" /// 6305 "Trichloroethylene" /// 6399 "Halogenated hydrocarbons NEC" /// 6900 "Other volatile solvents NEC" /// 6901 "Acetone" /// 6902 "Ethyl" /// 6999 "Other volatile solvents NEC" /// 7100 "Cannabinoids" /// 7101 "Cannabinoids agonists" /// 7102 "Cannabinoid" /// 7199 "Cannabinoids NEC" /// 9000 "MISCELLANEOUS" /// 9100 "Diuretics" /// 9101 "Antikaliuretics" /// 9102 "Loop diuretics" /// 9103 "Thiazides" /// 9199 "Diuretics, NEC" /// 9200 "Opioid antagonists NEC" /// 9201 "Naloxone" /// 9202 "Naltrexone" /// 9299 "Opioid" /// 9300 "MISCLLANEOUS" /// 9301 "Laxatives" /// 9900 "Other" label values pt25 Prim_drug
However, if I used /* ... */ to disable the following part, which is the last section of the value labels (as seen below), and remove the three slashes after "Naltrexone", the code works!
It appears that the code only runs up to the "Naltrexone" position and from "Opioid" onwards the code refuses to execute.
Believe it or not, if you add the 9299 "Opioid" line to the code, STATA will pop up with a invalid syntax error.
Code:
...
...
9201 "Naloxone" ///
9202 "Naltrexone"
/* 9299 "Opioid" ///
9300 "MISCLLANEOUS" ///
9301 "Laxatives" ///
9900 "Other " */
label values pt25 Prim_drug

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